Jones: Flora of Illinois, 84. Leguminosae 159 



5. Twigs and petioles hispid; petals 5; pods linear, hispid, seveial-seeded 



- 20. Robinia 



5. Twigs and petioles not hispid; corolla of one purple petal; pods short, 



I -2-seeded 16. Atnorpha 



4. Trees ; petals 5. 



6. Leaves odd-pinnate, with 5-17 leaflets; flowers white, 1-2.5 cm. long. 



7. Stipules spiny, woody; stipels setaceous; bark rough; stamens diadelphous; 

 racemes 7-15 cm. long 20. Robinia 



7. Stipules and stipels none; bark smooth; wood yellow; stamens distinct; 



inflorescence 15-50 cm. long 7. Cladrastis 



6. Leaves l-2-pinnate. 



8. Leaflets ovate, entire, acute or acuminate; flowers pinkish white, 1.5 cm. 



long, in many-flowered racemes; pods woody; trees without spines 



4. C\;nmocladus 



8. Leaflets oval, remotely denticulate, obtuse; flowers small, greenish yellow, 

 in axillary spikes; pods leathery; trees usually with spines on the trunk 



and branches 5. Cledilsia 



3. Twining or climbing shrubs, not prickly; flowers purple, showy, racemose; petals 



5; leaflets 9-13; pods many-seeded 21. Wisteria 



. Herbs. 



9. Leaves simple; petals yellow 9. Crolalaria 



9. Leaves compound (rarely 1 -foliolate). 



10. Leaves even-pinnate (or bipinnate), or leaflets only 2. 

 1 1 . Leaves ending in a tendril; flowers papilionaceous. 



12. Style terete, pubescent near the apex 27. Vicia 



12. Style flattened, pubescent along the inner side 28. Lalhyrus 



II. Leaves not ending in a tendril; leaflets numerous, small; flowers not at all 



papilionaceous, in globose heads. 



13. Leaves bipinnate. 



14. Plants glabrous or nearly so; flowers greenish white; petals distinct 



or nearly so; pods flat, smooth 1. Desmanihus 



14. Plants with recurved prickles; flowers rose colored; corolla funnel- 

 form; pods prickly, 4-angled, or nearly terete 2. Schranl^ia 



13. Leaves pinnate; flowers yellow 6. Cassia 



10. Leaves not even-pinnate. 



15. Leaves trifoliolate, or digitate with usually not more than 5 leaflets (rarely 

 unifoliolate). 

 16. Leaves (and other parts of the plant) more or less glandular-punctate; 



leaflets 3-5, entire 15. Psoralea 



16. Leaves not at all glandular-punctate. 

 17. Leaflets toothed. 



18. Flowers in heads or spikes. 



19. Pods straight II. Trifolium 



19. Pods curved or coiled 13. Medicago 



18. Flowers reflexed in long slender racemes, white or yellow; pods 



small, straight, reflexed 12. Melilotus 



17. Leaflets entire. 



20. Fruit a loment, i.e., breaking transversely into I -seeded, inde- 

 hiscent segments. 

 21. Pods 1 -several-jointed and -seeded; leaflets usually stipellate; 



flowers purple or white 24. Desmodium 



21. Pods of a single 1 -seeded joint (the lower joint when present 



empty and stalk-like) ; leaflets without stipels, usually 



prominently veined. 



22. Flowers purplish or yellowish white; stamens diadelphous 



(9+ 1); anthers all alike; pods not longitudinally 



ribbed 25. Lespedeza 



22. Flowers yellow; stamens monadelphous ; anthers in 2 

 series; pods longitudinally ribbed 26. Sli}losanthes 



